On Mon, Feb 10, 2020 at 12:12 AM Greg Kroah-Hartman
wrote:
>
> When calling debugfs functions, there is no need to ever check the
> return value. The function can work or not, but the code logic should
> never do something different based on this.
For memtrace debugfs is the only way to actually use the feature. It'd
be nice if it still printed out *something* if it failed to create the
files rather than just being mysteriously absent, but maybe debugfs
itself does that. Looks fine otherwise.
Reviewed-by: Oliver O'Halloran
> Cc: Benjamin Herrenschmidt
> Cc: Paul Mackerras
> Cc: Michael Ellerman
> Cc: Sukadev Bhattiprolu
> Cc: linuxppc-dev@lists.ozlabs.org
> Signed-off-by: Greg Kroah-Hartman
> ---
> arch/powerpc/platforms/powernv/memtrace.c | 7
> arch/powerpc/platforms/powernv/opal-imc.c | 24 --
> arch/powerpc/platforms/powernv/pci-ioda.c | 5 ---
> arch/powerpc/platforms/powernv/vas-debug.c | 37 ++
> 4 files changed, 10 insertions(+), 63 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powernv/memtrace.c
> b/arch/powerpc/platforms/powernv/memtrace.c
> index eb2e75dac369..d6d64f8718e6 100644
> --- a/arch/powerpc/platforms/powernv/memtrace.c
> +++ b/arch/powerpc/platforms/powernv/memtrace.c
> @@ -187,11 +187,6 @@ static int memtrace_init_debugfs(void)
>
> snprintf(ent->name, 16, "%08x", ent->nid);
> dir = debugfs_create_dir(ent->name, memtrace_debugfs_dir);
> - if (!dir) {
> - pr_err("Failed to create debugfs directory for node
> %d\n",
> - ent->nid);
> - return -1;
> - }
>
> ent->dir = dir;
> debugfs_create_file("trace", 0400, dir, ent, _fops);
> @@ -314,8 +309,6 @@ static int memtrace_init(void)
> {
> memtrace_debugfs_dir = debugfs_create_dir("memtrace",
> powerpc_debugfs_root);
> - if (!memtrace_debugfs_dir)
> - return -1;
>
> debugfs_create_file("enable", 0600, memtrace_debugfs_dir,
> NULL, _init_fops);
> diff --git a/arch/powerpc/platforms/powernv/opal-imc.c
> b/arch/powerpc/platforms/powernv/opal-imc.c
> index 000b350d4060..968b9a4d1cd9 100644
> --- a/arch/powerpc/platforms/powernv/opal-imc.c
> +++ b/arch/powerpc/platforms/powernv/opal-imc.c
> @@ -35,11 +35,10 @@ static int imc_mem_set(void *data, u64 val)
> }
> DEFINE_DEBUGFS_ATTRIBUTE(fops_imc_x64, imc_mem_get, imc_mem_set,
> "0x%016llx\n");
>
> -static struct dentry *imc_debugfs_create_x64(const char *name, umode_t mode,
> -struct dentry *parent, u64
> *value)
> +static void imc_debugfs_create_x64(const char *name, umode_t mode,
> + struct dentry *parent, u64 *value)
> {
> - return debugfs_create_file_unsafe(name, mode, parent,
> - value, _imc_x64);
> + debugfs_create_file_unsafe(name, mode, parent, value, _imc_x64);
> }
>
> /*
> @@ -59,9 +58,6 @@ static void export_imc_mode_and_cmd(struct device_node
> *node,
>
> imc_debugfs_parent = debugfs_create_dir("imc", powerpc_debugfs_root);
>
> - if (!imc_debugfs_parent)
> - return;
> -
> if (of_property_read_u32(node, "cb_offset", _offset))
> cb_offset = IMC_CNTL_BLK_OFFSET;
>
> @@ -69,21 +65,15 @@ static void export_imc_mode_and_cmd(struct device_node
> *node,
> loc = (u64)(ptr->vbase) + cb_offset;
> imc_mode_addr = (u64 *)(loc + IMC_CNTL_BLK_MODE_OFFSET);
> sprintf(mode, "imc_mode_%d", (u32)(ptr->id));
> - if (!imc_debugfs_create_x64(mode, 0600, imc_debugfs_parent,
> - imc_mode_addr))
> - goto err;
> + imc_debugfs_create_x64(mode, 0600, imc_debugfs_parent,
> + imc_mode_addr);
>
> imc_cmd_addr = (u64 *)(loc + IMC_CNTL_BLK_CMD_OFFSET);
> sprintf(cmd, "imc_cmd_%d", (u32)(ptr->id));
> - if (!imc_debugfs_create_x64(cmd, 0600, imc_debugfs_parent,
> - imc_cmd_addr))
> - goto err;
> + imc_debugfs_create_x64(cmd, 0600, imc_debugfs_parent,
> + imc_cmd_addr);
> ptr++;
> }
> - return;
> -
> -err:
> - debugfs_remove_recursive(imc_debugfs_parent);
> }
>
> /*
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c
> b/arch/powerpc/platforms/powernv/pci-ioda.c
> index 22c22cd7bd82..57d3a6af1d52 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -3174,11 +3174,6 @@ static void pnv_pci_ioda_create_dbgfs(void)
>
> sprintf(name, "PCI%04x",
