From 1f6f31a03e3aed0854a6aa3ab763c3d3b2ff42ff Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 11 May 2007 12:33:09 +0200 Subject: USB storage: sg chaining support [PATCH] USB storage: sg chaining support Modify usb_stor_access_xfer_buf() to take a pointer to an sg entry pointer, so we can keep track of that instead of passing around an integer index (which we can't use when dealing with multiple scatterlist arrays). Signed-off-by: Jens Axboe --- drivers/usb/storage/sddr09.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) (limited to 'drivers/usb/storage/sddr09.c') diff --git a/drivers/usb/storage/sddr09.c b/drivers/usb/storage/sddr09.c index b2ed2a3e6fc..b12202c5da2 100644 --- a/drivers/usb/storage/sddr09.c +++ b/drivers/usb/storage/sddr09.c @@ -705,7 +705,8 @@ sddr09_read_data(struct us_data *us, unsigned char *buffer; unsigned int lba, maxlba, pba; unsigned int page, pages; - unsigned int len, index, offset; + unsigned int len, offset; + struct scatterlist *sg; int result; // Figure out the initial LBA and page @@ -730,7 +731,8 @@ sddr09_read_data(struct us_data *us, // contiguous LBA's. Another exercise left to the student. result = 0; - index = offset = 0; + offset = 0; + sg = NULL; while (sectors > 0) { @@ -777,7 +779,7 @@ sddr09_read_data(struct us_data *us, // Store the data in the transfer buffer usb_stor_access_xfer_buf(buffer, len, us->srb, - &index, &offset, TO_XFER_BUF); + &sg, &offset, TO_XFER_BUF); page = 0; lba++; @@ -931,7 +933,8 @@ sddr09_write_data(struct us_data *us, unsigned int pagelen, blocklen; unsigned char *blockbuffer; unsigned char *buffer; - unsigned int len, index, offset; + unsigned int len, offset; + struct scatterlist *sg; int result; // Figure out the initial LBA and page @@ -968,7 +971,8 @@ sddr09_write_data(struct us_data *us, } result = 0; - index = offset = 0; + offset = 0; + sg = NULL; while (sectors > 0) { @@ -987,7 +991,7 @@ sddr09_write_data(struct us_data *us, // Get the data from the transfer buffer usb_stor_access_xfer_buf(buffer, len, us->srb, - &index, &offset, FROM_XFER_BUF); + &sg, &offset, FROM_XFER_BUF); result = sddr09_write_lba(us, lba, page, pages, buffer, blockbuffer); -- cgit v1.2.3-70-g09d2