From e36c048a9bd853b64c2b32a2ed90be2eff9bbd62 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 10 Jan 2018 21:51:05 +0100 Subject: CIFS: SMBD: work around gcc -Wmaybe-uninitialized warning GCC versions from 4.9 to 6.3 produce a false-positive warning when dealing with a conditional spin_lock_irqsave(): fs/cifs/smbdirect.c: In function 'smbd_recv_buf': include/linux/spinlock.h:260:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] This function calls some sleeping interfaces, so it is clear that it does not get called with interrupts disabled and there is no need to save the irq state before taking the spinlock. This lets us remove the variable, which makes the function slightly more efficient and avoids the warning. A further cleanup could do the same change for other functions in this file, but I did not want to take this too far for now. Fixes: ac69f66e54ca ("CIFS: SMBD: Implement function to receive data via RDMA receive") Signed-off-by: Arnd Bergmann Signed-off-by: Steve French --- fs/cifs/smbdirect.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) (limited to 'fs/cifs') diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c index f527e22650f5..f9234ed83a60 100644 --- a/fs/cifs/smbdirect.c +++ b/fs/cifs/smbdirect.c @@ -1862,7 +1862,6 @@ int smbd_recv_buf(struct smbd_connection *info, char *buf, unsigned int size) int to_copy, to_read, data_read, offset; u32 data_length, remaining_data_length, data_offset; int rc; - unsigned long flags; again: if (info->transport_status != SMBD_CONNECTED) { @@ -1935,15 +1934,13 @@ again: * end of the queue */ if (!queue_length) - spin_lock_irqsave( - &info->reassembly_queue_lock, - flags); + spin_lock_irq( + &info->reassembly_queue_lock); list_del(&response->list); queue_removed++; if (!queue_length) - spin_unlock_irqrestore( - &info->reassembly_queue_lock, - flags); + spin_unlock_irq( + &info->reassembly_queue_lock); info->count_reassembly_queue--; info->count_dequeue_reassembly_queue++; @@ -1963,10 +1960,10 @@ again: to_read, data_read, offset); } - spin_lock_irqsave(&info->reassembly_queue_lock, flags); + spin_lock_irq(&info->reassembly_queue_lock); info->reassembly_data_length -= data_read; info->reassembly_queue_length -= queue_removed; - spin_unlock_irqrestore(&info->reassembly_queue_lock, flags); + spin_unlock_irq(&info->reassembly_queue_lock); info->first_entry_offset = offset; log_read(INFO, "returning to thread data_read=%d " -- cgit v1.2.3-59-g8ed1b