From: Andi Kleen Date: Sun, 13 Jan 2008 16:41:43 +0000 (+0100) Subject: [SCSI] sg: Only print SCSI data direction warning once for a command X-Git-Tag: v2.6.25-rc1~1230^2~38 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eaa3e22e8d32bf7a6176f04efad90f4a5aa67f58;p=linux-2.6 [SCSI] sg: Only print SCSI data direction warning once for a command When I use cdparanoia my logs get spammed a lot by printk: 464 messages suppressed. sg_write: data in/out 30576/30576 bytes for SCSI command 0xbe--guessing data in; program cdparanoia not setting count and/or reply_len properly printk: 1078 messages suppressed. and many more of those. With this patch the message is only printed once for a command in a row. v1->v2: Prevent rate limit messages too (pointed out by jejb) Signed-off-by: Andi Kleen Acked-by: Douglas Gilbert Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index f1871ea040..e65f5d4326 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -602,8 +602,9 @@ sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) * but is is possible that the app intended SG_DXFER_TO_DEV, because there * is a non-zero input_size, so emit a warning. */ - if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) - if (printk_ratelimit()) + if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { + static char cmd[TASK_COMM_LEN]; + if (strcmp(current->comm, cmd) && printk_ratelimit()) { printk(KERN_WARNING "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" "guessing data in;\n" KERN_WARNING " " @@ -611,6 +612,9 @@ sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) old_hdr.reply_len - (int)SZ_SG_HEADER, input_size, (unsigned int) cmnd[0], current->comm); + strcpy(cmd, current->comm); + } + } k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); return (k < 0) ? k : count; }