#ifndef _XFS_CKSUM_H #define _XFS_CKSUM_H 1 #define XFS_CRC_SEED (~(__uint32_t)0) /* * Calculate the intermediate checksum for a buffer that has the CRC field * inside it. The offset of the 32bit crc fields is passed as the * cksum_offset parameter. We do not modify the buffer during verification, * hence we have to split the CRC calculation across the cksum_offset. */ static inline __uint32_t xfs_start_cksum_safe(char *buffer, size_t length, unsigned long cksum_offset) { __uint32_t zero = 0; __uint32_t crc; /* Calculate CRC up to the checksum. */ crc = crc32c(XFS_CRC_SEED, buffer, cksum_offset); /* Skip checksum field */ crc = crc32c(crc, &zero, sizeof(__u32)); /* Calculate the rest of the CRC. */ return crc32c(crc, &buffer[cksum_offset + sizeof(__be32)], length - (cksum_offset + sizeof(__be32))); } /* * Fast CRC method where the buffer is modified. Callers must have exclusive * access to the buffer while the calculation takes place. */ static inline __uint32_t xfs_start_cksum_update(char *buffer, size_t length, unsigned long cksum_offset) { /* zero the CRC field */ *(__le32 *)(buffer + cksum_offset) = 0; /* single pass CRC calculation for the entire buffer */ return crc32c(XFS_CRC_SEED, buffer, length); } /* * Convert the intermediate checksum to the final ondisk format. * * The CRC32c calculation uses LE format even on BE machines, but returns the * result in host endian format. Hence we need to byte swap it back to LE format * so that it is consistent on disk. */ static inline __le32 xfs_end_cksum(__uint32_t crc) { return ~cpu_to_le32(crc); } /* * Helper to generate the checksum for a buffer. * * This modifies the buffer temporarily - callers must have exclusive * access to the buffer while the calculation takes place. */ static inline void xfs_update_cksum(char *buffer, size_t length, unsigned long cksum_offset) { __uint32_t crc = xfs_start_cksum_update(buffer, length, cksum_offset); *(__le32 *)(buffer + cksum_offset) = xfs_end_cksum(crc); } /* * Helper to verify the checksum for a buffer. */ static inline int xfs_verify_cksum(char *buffer, size_t length, unsigned long cksum_offset) { __uint32_t crc = xfs_start_cksum_safe(buffer, length, cksum_offset); return *(__le32 *)(buffer + cksum_offset) == xfs_end_cksum(crc); } #endif /* _XFS_CKSUM_H */ ='id' value='407788b51db6f6aab499d02420082f436abf3238'/>
path: root/include/uapi/scsi/scsi_netlink.h
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authorTony Lindgren <tony@atomide.com>2017-01-24 09:18:57 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-25 11:02:29 +0100
commit407788b51db6f6aab499d02420082f436abf3238 (patch)
treeb2fb3c885baf47cd2bd8ee0429f423b352e11905 /include/uapi/scsi/scsi_netlink.h
parent7a308bb3016f57e5be11a677d15b821536419d36 (diff)
usb: musb: Fix host mode error -71 regression
Commit 467d5c980709 ("usb: musb: Implement session bit based runtime PM for musb-core") started implementing musb generic runtime PM support by introducing devctl register session bit based state control. This caused a regression where if a USB mass storage device is connected to a USB hub, we can get: usb 1-1: reset high-speed USB device number 2 using musb-hdrc usb 1-1: device descriptor read/64, error -71 usb 1-1.1: new high-speed USB device number 4 using musb-hdrc This is because before the USB storage device is connected, musb is in OTG_STATE_A_SUSPEND. And we currently only set need_finish_resume in musb_stage0_irq() and the related code calling finish_resume_work in musb_resume() and musb_runtime_resume() never gets called. To fix the issue, we can call schedule_delayed_work() directly in musb_stage0_irq() to have finish_resume_work run. And we should no longer never get interrupts when when suspended. We have changed musb to no longer need pm_runtime_irqsafe(). The need_finish_resume flag was added in commit 9298b4aad37e ("usb: musb: fix device hotplug behind hub") and no longer applies as far as I can tell. So let's just remove the earlier code that no longer is needed. Fixes: 467d5c980709 ("usb: musb: Implement session bit based runtime PM for musb-core") Reported-by: Bin Liu <b-liu@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Bin Liu <b-liu@ti.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/uapi/scsi/scsi_netlink.h')