From: Jeff Garzik Date: Fri, 27 May 2005 01:54:27 +0000 (-0400) Subject: libata: Fix use-after-iounmap X-Git-Tag: v2.6.12-rc6~86^2~1^2 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aa8f0dc6c3dbf1cf3ff58f3e945c981be134814d;p=linux-2.6 libata: Fix use-after-iounmap Jens Axboe pointed out that the iounmap() call in libata was occurring too early, and some drivers (ahci, probably others) were using ioremap'd memory after it had been unmapped. The patch should address that problem by way of improving the libata driver API: * move ->host_stop() call after all ->port_stop() calls have occurred. * create default helper function ata_host_stop(), and move iounmap() call there. * add ->host_stop_prewalk() hook, use it in sata_qstor.c (hi Mark). sata_qstor appears to require the host-stop-before-port-stop ordering that existed prior to applying the attached patch. --- diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c index da5bd33d98..8b468a6287 100644 --- a/drivers/scsi/ahci.c +++ b/drivers/scsi/ahci.c @@ -289,6 +289,8 @@ static void ahci_host_stop(struct ata_host_set *host_set) { struct ahci_host_priv *hpriv = host_set->private_data; kfree(hpriv); + + ata_host_stop(host_set); } static int ahci_port_start(struct ata_port *ap) diff --git a/drivers/scsi/ata_piix.c b/drivers/scsi/ata_piix.c index 3867f91ef8..54c52349ad 100644 --- a/drivers/scsi/ata_piix.c +++ b/drivers/scsi/ata_piix.c @@ -153,6 +153,7 @@ static struct ata_port_operations piix_pata_ops = { .port_start = ata_port_start, .port_stop = ata_port_stop, + .host_stop = ata_host_stop, }; static struct ata_port_operations piix_sata_ops = { @@ -180,6 +181,7 @@ static struct ata_port_operations piix_sata_ops = { .port_start = ata_port_start, .port_stop = ata_port_stop, + .host_stop = ata_host_stop, }; static struct ata_port_info piix_port_info[] = { diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c index ee9b96da84..2b41cd3a8e 100644 --- a/drivers/scsi/libata-core.c +++ b/drivers/scsi/libata-core.c @@ -3321,6 +3321,13 @@ void ata_port_stop (struct ata_port *ap) dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma); } +void ata_host_stop (struct ata_host_set *host_set) +{ + if (host_set->mmio_base) + iounmap(host_set->mmio_base); +} + + /** * ata_host_remove - Unregister SCSI host structure with upper layers * @ap: Port to unregister @@ -3877,10 +3884,6 @@ void ata_pci_remove_one (struct pci_dev *pdev) } free_irq(host_set->irq, host_set); - if (host_set->ops->host_stop) - host_set->ops->host_stop(host_set); - if (host_set->mmio_base) - iounmap(host_set->mmio_base); for (i = 0; i < host_set->n_ports; i++) { ap = host_set->ports[i]; @@ -3899,6 +3902,9 @@ void ata_pci_remove_one (struct pci_dev *pdev) scsi_host_put(ap->host); } + if (host_set->ops->host_stop) + host_set->ops->host_stop(host_set); + kfree(host_set); pci_release_regions(pdev); @@ -3996,6 +4002,7 @@ EXPORT_SYMBOL_GPL(ata_chk_err); EXPORT_SYMBOL_GPL(ata_exec_command); EXPORT_SYMBOL_GPL(ata_port_start); EXPORT_SYMBOL_GPL(ata_port_stop); +EXPORT_SYMBOL_GPL(ata_host_stop); EXPORT_SYMBOL_GPL(ata_interrupt); EXPORT_SYMBOL_GPL(ata_qc_prep); EXPORT_SYMBOL_GPL(ata_bmdma_setup); diff --git a/drivers/scsi/sata_nv.c b/drivers/scsi/sata_nv.c index 69009f853a..b0403ccd8a 100644 --- a/drivers/scsi/sata_nv.c +++ b/drivers/scsi/sata_nv.c @@ -329,6 +329,8 @@ static void nv_host_stop (struct ata_host_set *host_set) host->host_desc->disable_hotplug(host_set); kfree(host); + + ata_host_stop(host_set); } static int nv_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) diff --git a/drivers/scsi/sata_promise.c b/drivers/scsi/sata_promise.c index c4e9e02981..b18c90582e 100644 --- a/drivers/scsi/sata_promise.c +++ b/drivers/scsi/sata_promise.c @@ -122,6 +122,7 @@ static struct ata_port_operations pdc_ata_ops = { .scr_write = pdc_sata_scr_write, .port_start = pdc_port_start, .port_stop = pdc_port_stop, + .host_stop = ata_host_stop, }; static struct ata_port_info pdc_port_info[] = { diff --git a/drivers/scsi/sata_qstor.c b/drivers/scsi/sata_qstor.c index dfd3621047..1383e8a28d 100644 --- a/drivers/scsi/sata_qstor.c +++ b/drivers/scsi/sata_qstor.c @@ -536,6 +536,8 @@ static void qs_host_stop(struct ata_host_set *host_set) writeb(0, mmio_base + QS_HCT_CTRL); /* disable host interrupts */ writeb(QS_CNFG3_GSRST, mmio_base + QS_HCF_CNFG3); /* global reset */ + + ata_host_stop(host_set); } static void qs_host_init(unsigned int chip_id, struct ata_probe_ent *pe) diff --git a/drivers/scsi/sata_sil.c b/drivers/scsi/sata_sil.c index 2b2ff48be3..238580d244 100644 --- a/drivers/scsi/sata_sil.c +++ b/drivers/scsi/sata_sil.c @@ -161,6 +161,7 @@ static struct ata_port_operations sil_ops = { .scr_write = sil_scr_write, .port_start = ata_port_start, .port_stop = ata_port_stop, + .host_stop = ata_host_stop, }; static struct ata_port_info sil_port_info[] = { diff --git a/drivers/scsi/sata_sis.c b/drivers/scsi/sata_sis.c index 5105ddd084..e418b89c6b 100644 --- a/drivers/scsi/sata_sis.c +++ b/drivers/scsi/sata_sis.c @@ -114,6 +114,7 @@ static struct ata_port_operations sis_ops = { .scr_write = sis_scr_write, .port_start = ata_port_start, .port_stop = ata_port_stop, + .host_stop = ata_host_stop, }; static struct ata_port_info sis_port_info = { diff --git a/drivers/scsi/sata_svw.c b/drivers/scsi/sata_svw.c index 05075bd3a8..edef1fa969 100644 --- a/drivers/scsi/sata_svw.c +++ b/drivers/scsi/sata_svw.c @@ -313,6 +313,7 @@ static struct ata_port_operations k2_sata_ops = { .scr_write = k2_sata_scr_write, .port_start = ata_port_start, .port_stop = ata_port_stop, + .host_stop = ata_host_stop, }; static void k2_sata_setup_port(struct ata_ioports *port, unsigned long base) diff --git a/drivers/scsi/sata_sx4.c b/drivers/scsi/sata_sx4.c index 70118650c4..140cea05de 100644 --- a/drivers/scsi/sata_sx4.c +++ b/drivers/scsi/sata_sx4.c @@ -245,6 +245,8 @@ static void pdc20621_host_stop(struct ata_host_set *host_set) iounmap(dimm_mmio); kfree(hpriv); + + ata_host_stop(host_set); } static int pdc_port_start(struct ata_port *ap) diff --git a/drivers/scsi/sata_uli.c b/drivers/scsi/sata_uli.c index 0bff4f475f..a71fb54eeb 100644 --- a/drivers/scsi/sata_uli.c +++ b/drivers/scsi/sata_uli.c @@ -113,6 +113,7 @@ static struct ata_port_operations uli_ops = { .port_start = ata_port_start, .port_stop = ata_port_stop, + .host_stop = ata_host_stop, }; static struct ata_port_info uli_port_info = { diff --git a/drivers/scsi/sata_via.c b/drivers/scsi/sata_via.c index 3a78306672..f43183c19a 100644 --- a/drivers/scsi/sata_via.c +++ b/drivers/scsi/sata_via.c @@ -134,6 +134,7 @@ static struct ata_port_operations svia_sata_ops = { .port_start = ata_port_start, .port_stop = ata_port_stop, + .host_stop = ata_host_stop, }; static struct ata_port_info svia_port_info = { diff --git a/drivers/scsi/sata_vsc.c b/drivers/scsi/sata_vsc.c index 2c28f0ad73..f67c34330a 100644 --- a/drivers/scsi/sata_vsc.c +++ b/drivers/scsi/sata_vsc.c @@ -230,6 +230,7 @@ static struct ata_port_operations vsc_sata_ops = { .scr_write = vsc_sata_scr_write, .port_start = ata_port_start, .port_stop = ata_port_stop, + .host_stop = ata_host_stop, }; static void __devinit vsc_sata_setup_port(struct ata_ioports *port, unsigned long base) diff --git a/include/linux/libata.h b/include/linux/libata.h index 1f7e2039a0..e74f301e9b 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -410,6 +410,7 @@ extern u8 ata_chk_err(struct ata_port *ap); extern void ata_exec_command(struct ata_port *ap, struct ata_taskfile *tf); extern int ata_port_start (struct ata_port *ap); extern void ata_port_stop (struct ata_port *ap); +extern void ata_host_stop (struct ata_host_set *host_set); extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs); extern void ata_qc_prep(struct ata_queued_cmd *qc); extern int ata_qc_issue_prot(struct ata_queued_cmd *qc);