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 <jens.axboe@oracle.com>
diff --git a/drivers/usb/storage/sddr09.c b/drivers/usb/storage/sddr09.c
index b2ed2a3..b12202c 100644
--- a/drivers/usb/storage/sddr09.c
+++ b/drivers/usb/storage/sddr09.c
@@ -705,7 +705,8 @@
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 @@
// 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 @@
// 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 @@
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 @@
}
result = 0;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;
while (sectors > 0) {
@@ -987,7 +991,7 @@
// 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);