From a6c976c6c4628ce0c9277c47e7545956d9d4f441 Mon Sep 17 00:00:00 2001 From: Matthew Dharm Date: Sun, 4 Dec 2005 21:59:45 -0800 Subject: [PATCH] [PATCH] USB Storage: more sddr09 cleanups This is the third of three patches to prepare the sddr09 subdriver for conversion to the Sim-SCSI framework. This patch (as596) moves the computation of the LBA to the start of the read/write routines, so that addresses completely beyond the end of the device can be detected and reported differently from transfers that are partially within the device's capacity. Signed-off-by: Alan Stern Acked-by: Andries Brouwer Signed-off-by: Matthew Dharm Signed-off-by: Greg Kroah-Hartman --- drivers/usb/storage/sddr09.c | 33 +++++++++++++++++++++++---------- 1 file changed, 23 insertions(+), 10 deletions(-) diff --git a/drivers/usb/storage/sddr09.c b/drivers/usb/storage/sddr09.c index 760fe9362b..b8e7802c87 100644 --- a/drivers/usb/storage/sddr09.c +++ b/drivers/usb/storage/sddr09.c @@ -711,6 +711,13 @@ sddr09_read_data(struct us_data *us, unsigned int len, index, offset; int result; + // Figure out the initial LBA and page + lba = address >> info->blockshift; + page = (address & info->blockmask); + maxlba = info->capacity >> (info->pageshift + info->blockshift); + if (lba >= maxlba) + return -EIO; + // Since we only read in one block at a time, we have to create // a bounce buffer and move the data a piece at a time between the // bounce buffer and the actual transfer buffer. @@ -722,11 +729,6 @@ sddr09_read_data(struct us_data *us, return -ENOMEM; } - // Figure out the initial LBA and page - lba = address >> info->blockshift; - page = (address & info->blockmask); - maxlba = info->capacity >> (info->pageshift + info->blockshift); - // This could be made much more efficient by checking for // contiguous LBA's. Another exercise left to the student. @@ -928,13 +930,20 @@ sddr09_write_data(struct us_data *us, unsigned int sectors) { struct sddr09_card_info *info = (struct sddr09_card_info *) us->extra; - unsigned int lba, page, pages; + unsigned int lba, maxlba, page, pages; unsigned int pagelen, blocklen; unsigned char *blockbuffer; unsigned char *buffer; unsigned int len, index, offset; int result; + // Figure out the initial LBA and page + lba = address >> info->blockshift; + page = (address & info->blockmask); + maxlba = info->capacity >> (info->pageshift + info->blockshift); + if (lba >= maxlba) + return -EIO; + // blockbuffer is used for reading in the old data, overwriting // with the new data, and performing ECC calculations @@ -961,10 +970,6 @@ sddr09_write_data(struct us_data *us, return -ENOMEM; } - // Figure out the initial LBA and page - lba = address >> info->blockshift; - page = (address & info->blockmask); - result = 0; index = offset = 0; @@ -975,6 +980,14 @@ sddr09_write_data(struct us_data *us, pages = min(sectors, info->blocksize - page); len = (pages << info->pageshift); + /* Not overflowing capacity? */ + if (lba >= maxlba) { + US_DEBUGP("Error: Requested lba %u exceeds " + "maximum %u\n", lba, maxlba); + result = -EIO; + break; + } + // Get the data from the transfer buffer usb_stor_access_xfer_buf(buffer, len, us->srb, &index, &offset, FROM_XFER_BUF); -- 2.39.5