xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

USB storage: sg chaining support

Browse Source 
[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>
This commit is contained in:
Jens Axboe
2007-05-11 12:33:09 +02:00
parent 53d412fce0
commit 1f6f31a03e
8 changed files with 62 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/usb/storage/sddr55.c
View File

@@ -167,7 +167,8 @@ static int sddr55_read_data(struct us_data *us,
unsigned long address;
unsigned short pages;
unsigned int len, index, offset;
unsigned int len, offset;
struct scatterlist *sg;
// 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
@@ -178,7 +179,8 @@ static int sddr55_read_data(struct us_data *us,
buffer = kmalloc(len, GFP_NOIO);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR; /* out of memory */
index = offset = 0;
offset = 0;
sg = NULL;
while (sectors>0) {
@@ -255,7 +257,7 @@ static int sddr55_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++;
@@ -287,7 +289,8 @@ static int sddr55_write_data(struct us_data *us,
unsigned short pages;
int i;
unsigned int len, index, offset;
unsigned int len, offset;
struct scatterlist *sg;
/* check if we are allowed to write */
if (info->read_only || info->force_read_only) {
@@ -304,7 +307,8 @@ static int sddr55_write_data(struct us_data *us,
buffer = kmalloc(len, GFP_NOIO);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR;
index = offset = 0;
offset = 0;
sg = NULL;
while (sectors > 0) {
@@ -322,7 +326,7 @@ static int sddr55_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);
US_DEBUGP("Write %02X pages, to PBA %04X"
" (LBA %04X) page %02X\n",