mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 08:21:14 +00:00
fcdaf6673d
This is an automatically generated commit which aids following Kernel patch history, as git will see the move and copy as a rename thus defeating the purpose. For the original discussion see: https://lists.openwrt.org/pipermail/openwrt-devel/2023-October/041673.html Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
69 lines
2.0 KiB
Diff
69 lines
2.0 KiB
Diff
From a2dd154377c9aa6ddda00d39b8c7c334e4fa16ff Mon Sep 17 00:00:00 2001
|
|
From: Damien Horsley <damien.horsley@imgtec.com>
|
|
Date: Tue, 22 Mar 2016 12:46:09 +0000
|
|
Subject: dmaengine: img-mdc: Handle early status read
|
|
|
|
It is possible that mdc_tx_status may be called before the first
|
|
node has been read from memory.
|
|
|
|
In this case, the residue value stored in the register is undefined.
|
|
Return the transfer size instead.
|
|
|
|
Signed-off-by: Damien Horsley <damien.horsley@imgtec.com>
|
|
---
|
|
drivers/dma/img-mdc-dma.c | 40 ++++++++++++++++++++++++----------------
|
|
1 file changed, 24 insertions(+), 16 deletions(-)
|
|
|
|
--- a/drivers/dma/img-mdc-dma.c
|
|
+++ b/drivers/dma/img-mdc-dma.c
|
|
@@ -618,25 +618,33 @@ static enum dma_status mdc_tx_status(str
|
|
(MDC_CMDS_PROCESSED_CMDS_DONE_MASK + 1);
|
|
|
|
/*
|
|
- * If the command loaded event hasn't been processed yet, then
|
|
- * the difference above includes an extra command.
|
|
+ * If the first node has not yet been read from memory,
|
|
+ * the residue register value is undefined
|
|
*/
|
|
- if (!mdesc->cmd_loaded)
|
|
- cmds--;
|
|
- else
|
|
- cmds += mdesc->list_cmds_done;
|
|
-
|
|
- bytes = mdesc->list_xfer_size;
|
|
- ldesc = mdesc->list;
|
|
- for (i = 0; i < cmds; i++) {
|
|
- bytes -= ldesc->xfer_size + 1;
|
|
- ldesc = ldesc->next_desc;
|
|
- }
|
|
- if (ldesc) {
|
|
- if (residue != MDC_TRANSFER_SIZE_MASK)
|
|
- bytes -= ldesc->xfer_size - residue;
|
|
+ if (!mdesc->cmd_loaded && !cmds) {
|
|
+ bytes = mdesc->list_xfer_size;
|
|
+ } else {
|
|
+ /*
|
|
+ * If the command loaded event hasn't been processed yet, then
|
|
+ * the difference above includes an extra command.
|
|
+ */
|
|
+ if (!mdesc->cmd_loaded)
|
|
+ cmds--;
|
|
else
|
|
+ cmds += mdesc->list_cmds_done;
|
|
+
|
|
+ bytes = mdesc->list_xfer_size;
|
|
+ ldesc = mdesc->list;
|
|
+ for (i = 0; i < cmds; i++) {
|
|
bytes -= ldesc->xfer_size + 1;
|
|
+ ldesc = ldesc->next_desc;
|
|
+ }
|
|
+ if (ldesc) {
|
|
+ if (residue != MDC_TRANSFER_SIZE_MASK)
|
|
+ bytes -= ldesc->xfer_size - residue;
|
|
+ else
|
|
+ bytes -= ldesc->xfer_size + 1;
|
|
+ }
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&mchan->vc.lock, flags);
|