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/datafab.c b/drivers/usb/storage/datafab.c
index c87ad1b..579e9f5 100644
--- a/drivers/usb/storage/datafab.c
+++ b/drivers/usb/storage/datafab.c
@@ -98,7 +98,8 @@
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;
// we're working in LBA mode. according to the ATA spec,
// we can support up to 28-bit addressing. I don't know if Datafab
@@ -155,7 +156,7 @@
// Store the data in the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, TO_XFER_BUF);
+ &sg, &sg_offset, TO_XFER_BUF);
sector += thistime;
totallen -= len;
@@ -181,7 +182,8 @@
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;
// we're working in LBA mode. according to the ATA spec,
// we can support up to 28-bit addressing. I don't know if Datafab
@@ -217,7 +219,7 @@
// Get the data from the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, FROM_XFER_BUF);
+ &sg, &sg_offset, FROM_XFER_BUF);
command[0] = 0;
command[1] = thistime;