Check gadget.quirk_ep_out_aligned_size to decide if buffer size requires
to be aligned to maxpacketsize of an out endpoint. ffs_epfile_io() needs
to pad epout buffer to match above condition if quirk is found.
Signed-off-by: David Cohen <david.a.co...@linux.intel.com>
---
drivers/usb/gadget/f_fs.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
index 75e4b7846a8d..e7c3c3119552 100644
--- a/drivers/usb/gadget/f_fs.c
+++ b/drivers/usb/gadget/f_fs.c
@@ -755,10 +755,13 @@ static ssize_t ffs_epfile_io(struct file *file,
char __user *buf, size_t len, int read)
{
struct ffs_epfile *epfile = file->private_data;
+ struct usb_gadget *gadget = epfile->ffs->gadget;
struct ffs_ep *ep;
char *data = NULL;
+ size_t data_len = 0;
ssize_t ret;
int halt;
+ size_t orig_len = len;
goto first_try;
do {
@@ -794,11 +797,30 @@ first_try:
goto error;
}
+ /*
+ * Controller requires buffer size to be aligned to
+ * maxpacketsize of an out endpoint.
+ */
+ if (gadget->quirk_ep_out_aligned_size && read) {
+ /*
+ * We pass 'orig_len' to usp_ep_align_maxpacketsize()
+ * due to we're in a loop and 'len' may have been
+ * changed.
+ */
+ len = usb_ep_align_maxpacketsize(ep->ep, orig_len);
+ if (data && len > data_len) {
+ kfree(data);
+ data = NULL;
+ data_len = 0;
+ }
+ }
+
/* Allocate & copy */
if (!halt && !data) {
data = kzalloc(len, GFP_KERNEL);
if (unlikely(!data))
return -ENOMEM;
+ data_len = len;
if (!read &&
unlikely(__copy_from_user(data, buf, len))) {
--
1.8.4.rc3
--
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