usb: gadget: composite: Test get_alt() presence instead of set_alt()

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By convention (according to doc) if function does not provide
get_alt() callback composite framework should assume that it has only
altsetting 0 and should respond with error if host tries to set
other one.

After commit dd4dff8b03 ("USB: composite: Fix bug: should test
set_alt function pointer before use it")
we started checking set_alt() callback instead of get_alt().
This check is useless as we check if set_alt() is set inside
usb_add_function() and fail if it's NULL.

Let's fix this check and move comment about why we check the get
method instead of set a little bit closer to prevent future false
fixes.

Fixes: dd4dff8b03 ("USB: composite: Fix bug: should test set_alt function pointer before use it")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

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This commit is contained in:

Krzysztof Opasiak 2016-12-20 19:52:16 +01:00 • committed by Felipe Balbi

parent 51c1685d95

commit 7e4da3fcf7

1 changed files with 8 additions and 4 deletions

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drivers/usb/gadget/composite.c

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