drivers/dma/xilinx/xilinx_dpdma.c:1172 xilinx_dpdma_synchronize() error: double unlocked 'chan->vchan.lock' (orig line 1170)

From: kernel test robot
Date: Tue Aug 11 2020 - 18:39:21 EST


tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: c636eef2ee3696f261a35f34989842701a107895
commit: 7cbb0c63de3fc218fd06ecfedb477772a4d12f76 dmaengine: xilinx: dpdma: Add the Xilinx DisplayPort DMA engine driver
date: 4 weeks ago
config: h8300-randconfig-m031-20200811 (attached as .config)
compiler: h8300-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

smatch warnings:
drivers/dma/xilinx/xilinx_dpdma.c:1172 xilinx_dpdma_synchronize() error: double unlocked 'chan->vchan.lock' (orig line 1170)

vim +1172 drivers/dma/xilinx/xilinx_dpdma.c

1140
1141 /**
1142 * xilinx_dpdma_synchronize - Synchronize callback execution
1143 * @dchan: DMA channel
1144 *
1145 * Synchronizing callback execution ensures that all previously issued
1146 * transfers have completed and all associated callbacks have been called and
1147 * have returned.
1148 *
1149 * This function waits for the DMA channel to stop. It assumes it has been
1150 * paused by a previous call to dmaengine_terminate_async(), and that no new
1151 * pending descriptors have been issued with dma_async_issue_pending(). The
1152 * behaviour is undefined otherwise.
1153 */
1154 static void xilinx_dpdma_synchronize(struct dma_chan *dchan)
1155 {
1156 struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
1157 unsigned long flags;
1158
1159 xilinx_dpdma_chan_stop(chan);
1160
1161 spin_lock_irqsave(&chan->vchan.lock, flags);
1162 if (chan->desc.pending) {
1163 vchan_terminate_vdesc(&chan->desc.pending->vdesc);
1164 chan->desc.pending = NULL;
1165 }
1166 if (chan->desc.active) {
1167 vchan_terminate_vdesc(&chan->desc.active->vdesc);
1168 chan->desc.active = NULL;
1169 }
> 1170 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1171
> 1172 vchan_synchronize(&chan->vchan);
1173 }
1174

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Attachment: .config.gz
Description: application/gzip