#ifndef _ASM_GENERIC_BITOPS___FFS_H_ #define _ASM_GENERIC_BITOPS___FFS_H_ #include /** * __ffs - find first bit in word. * @word: The word to search * * Undefined if no bit exists, so code should check against 0 first. */ static __always_inline unsigned long __ffs(unsigned long word) { int num = 0; #if BITS_PER_LONG == 64 if ((word & 0xffffffff) == 0) { num += 32; word >>= 32; } #endif if ((word & 0xffff) == 0) { num += 16; word >>= 16; } if ((word & 0xff) == 0) { num += 8; word >>= 8; } if ((word & 0xf) == 0) { num += 4; word >>= 4; } if ((word & 0x3) == 0) { num += 2; word >>= 2; } if ((word & 0x1) == 0) num += 1; return num; } #endif /* _ASM_GENERIC_BITOPS___FFS_H_ */ ='/cgit.cgi/'>index : net-next.git
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authorJohan Hovold <johan@kernel.org>2017-01-30 11:26:38 +0100
committerJiri Kosina <jkosina@suse.cz>2017-01-31 12:59:32 +0100
commit7a7b5df84b6b4e5d599c7289526eed96541a0654 (patch)
treecf7514c7ddf4410fe37ca9099a2785e1cf08fa7d /net/ipv4/tcp_input.c
parent877a021e08ccb6434718c0cc781fdf943c884cc0 (diff)
HID: cp2112: fix sleep-while-atomic
A recent commit fixing DMA-buffers on stack added a shared transfer buffer protected by a spinlock. This is broken as the USB HID request callbacks can sleep. Fix this up by replacing the spinlock with a mutex. Fixes: 1ffb3c40ffb5 ("HID: cp2112: make transfer buffers DMA capable") Cc: stable <stable@vger.kernel.org> # 4.9 Signed-off-by: Johan Hovold <johan@kernel.org> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'net/ipv4/tcp_input.c')