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dmaengine: dw-edma: Stop checking debugfs_create_*() return value

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The debugfs_create_*() functions never return NULL, so checking their
return value for NULL is pointless. Secondly, the debugfs subsystem is
designed to be as simple as possible, so if one of the debugfs_create_*()
method in a hierarchy fails, the following methods should silently return
the passed erroneous parental dentry. Finally, the code should work no
matter whether anything debugfs-related fails.

To make code simpler and debugfs-independent, stop checking the
debugfs_create_*() return values.

If the debugfs file system is unavailable, skip the debugfs node
initialization altogether to preserve some memory space.

Link: https://lore.kernel.org/r/20230113171409.30470-12-Sergey.Semin@baikalelectronics.ru
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Serge Semin 2023-01-13 20:13:53 +03:00 committed by Lorenzo Pieralisi
parent 7ca9f025a7
commit 37d058aae7
1 changed files with 5 additions and 15 deletions
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20
drivers/dma/dw-edma/dw-edma-v0-debugfs.c
View file

@ -100,9 +100,8 @@ static void dw_edma_debugfs_create_x32(const struct debugfs_entries entries[],
int i;
for (i = 0; i < nr_entries; i++) {
if (!debugfs_create_file_unsafe(entries[i].name, 0444, dir,
entries[i].reg, &fops_x32))
break;
debugfs_create_file_unsafe(entries[i].name, 0444, dir,
entries[i].reg, &fops_x32);
}
}
@ -168,8 +167,6 @@ static void dw_edma_debugfs_regs_wr(struct dentry *dir)
char name[16];
regs_dir = debugfs_create_dir(WRITE_STR, dir);
if (!regs_dir)
return;
nr_entries = ARRAY_SIZE(debugfs_regs);
dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
@ -184,8 +181,6 @@ static void dw_edma_debugfs_regs_wr(struct dentry *dir)
snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);
ch_dir = debugfs_create_dir(name, regs_dir);
if (!ch_dir)
return;
dw_edma_debugfs_regs_ch(&regs->type.unroll.ch[i].wr, ch_dir);
@ -237,8 +232,6 @@ static void dw_edma_debugfs_regs_rd(struct dentry *dir)
char name[16];
regs_dir = debugfs_create_dir(READ_STR, dir);
if (!regs_dir)
return;
nr_entries = ARRAY_SIZE(debugfs_regs);
dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
@ -253,8 +246,6 @@ static void dw_edma_debugfs_regs_rd(struct dentry *dir)
snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);
ch_dir = debugfs_create_dir(name, regs_dir);
if (!ch_dir)
return;
dw_edma_debugfs_regs_ch(&regs->type.unroll.ch[i].rd, ch_dir);
@ -273,8 +264,6 @@ static void dw_edma_debugfs_regs(void)
int nr_entries;
regs_dir = debugfs_create_dir(REGISTERS_STR, dw->debugfs);
if (!regs_dir)
return;
nr_entries = ARRAY_SIZE(debugfs_regs);
dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
@ -285,6 +274,9 @@ static void dw_edma_debugfs_regs(void)
void dw_edma_v0_debugfs_on(struct dw_edma *_dw)
{
if (!debugfs_initialized())
return;
dw = _dw;
if (!dw)
return;
@ -294,8 +286,6 @@ void dw_edma_v0_debugfs_on(struct dw_edma *_dw)
return;
dw->debugfs = debugfs_create_dir(dw->name, NULL);
if (!dw->debugfs)
return;
debugfs_create_u32("mf", 0444, dw->debugfs, &dw->chip->mf);
debugfs_create_u16("wr_ch_cnt", 0444, dw->debugfs, &dw->wr_ch_cnt);