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authorVincent Pelletier <plr.vincent@gmail.com>2016-12-15 12:47:41 +0000
committerFelipe Balbi <felipe.balbi@linux.intel.com>2017-01-02 10:55:28 +0200
commit96a420d2d37cc019d0fbb95c9f0e965fa1080e1f (patch)
tree1d72daa782156faeae0244b0611c745b3d546929 /drivers/usb/gadget
parent7e4da3fcf7c9fe042f2f7cb7bf23861a899b4a8f (diff)
downloadop-kernel-dev-96a420d2d37cc019d0fbb95c9f0e965fa1080e1f.zip
op-kernel-dev-96a420d2d37cc019d0fbb95c9f0e965fa1080e1f.tar.gz
usb: gadget: f_fs: Document eventfd effect on descriptor format.
When FUNCTIONFS_EVENTFD flag is set, __ffs_data_got_descs reads a 32bits, little-endian value right after the fixed structure header, and passes it to eventfd_ctx_fdget. Document this. Also, rephrase a comment to be affirmative about the role of string descriptor at index 0. Ref: USB 2.0 spec paragraph "9.6.7 String", and also checked to still be current in USB 3.0 spec paragraph "9.6.9 String". Signed-off-by: Vincent Pelletier <plr.vincent@gmail.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/gadget')
-rw-r--r--drivers/usb/gadget/function/f_fs.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index aab3fc1..818f499 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2091,8 +2091,8 @@ static int __ffs_data_do_entity(enum ffs_entity_type type,
case FFS_STRING:
/*
- * Strings are indexed from 1 (0 is magic ;) reserved
- * for languages list or some such)
+ * Strings are indexed from 1 (0 is reserved
+ * for languages list)
*/
if (*valuep > helper->ffs->strings_count)
helper->ffs->strings_count = *valuep;
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