| Message ID | 20220907164606.65742-9-andriy.shevchenko@linux.intel.com |
|---|---|
| State | New |
| Headers | show |
| Series | ACPI: unify _UID handling as integer | expand |
Hi, On 9/7/22 18:46, Andy Shevchenko wrote: > ACPI utils provide acpi_dev_uid_to_integer() helper to extract _UID as > an integer. Use it instead of custom approach. > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > --- > drivers/firmware/efi/dev-path-parser.c | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/drivers/firmware/efi/dev-path-parser.c b/drivers/firmware/efi/dev-path-parser.c > index eb9c65f97841..113b3ca1bd76 100644 > --- a/drivers/firmware/efi/dev-path-parser.c > +++ b/drivers/firmware/efi/dev-path-parser.c > @@ -15,9 +15,11 @@ > static long __init parse_acpi_path(const struct efi_dev_path *node, > struct device *parent, struct device **child) > { > - char hid[ACPI_ID_LEN], uid[11]; /* UINT_MAX + null byte */ > struct acpi_device *adev; > struct device *phys_dev; > + char hid[ACPI_ID_LEN]; > + long ret; "long ret" should be "int ret" here since that is what acpi_dev_uid_to_integer() returns. Regards, Hans > + u64 uid; > > if (node->header.length != 12) > return -EINVAL; > @@ -27,12 +29,12 @@ static long __init parse_acpi_path(const struct efi_dev_path *node, > 'A' + ((node->acpi.hid >> 5) & 0x1f) - 1, > 'A' + ((node->acpi.hid >> 0) & 0x1f) - 1, > node->acpi.hid >> 16); > - sprintf(uid, "%u", node->acpi.uid); > > for_each_acpi_dev_match(adev, hid, NULL, -1) { > - if (adev->pnp.unique_id && !strcmp(adev->pnp.unique_id, uid)) > + ret = acpi_dev_uid_to_integer(adev, &uid); > + if (ret == -ENODATA && node->acpi.uid == 0) > break; > - if (!adev->pnp.unique_id && node->acpi.uid == 0) > + if (ret == 0 && node->acpi.uid == uid) > break; > } > if (!adev)
On Thu, Sep 08, 2022 at 10:20:47AM +0200, Ard Biesheuvel wrote: > On Wed, 7 Sept 2022 at 18:57, Andy Shevchenko > <andriy.shevchenko@linux.intel.com> wrote: ... > > for_each_acpi_dev_match(adev, hid, NULL, -1) { > > - if (adev->pnp.unique_id && !strcmp(adev->pnp.unique_id, uid)) > > + ret = acpi_dev_uid_to_integer(adev, &uid); > > + if (ret == -ENODATA && node->acpi.uid == 0) > > break; > > - if (!adev->pnp.unique_id && node->acpi.uid == 0) > > + if (ret == 0 && node->acpi.uid == uid) > > Is it necessary to reorder the conditions here? I.e., why not Code-wise there should be not much difference which does not affect the flow, I think I moved it to be closer to the pattern "let's handle errors first", but in this case I'm fine with your proposal. > > + ret = acpi_dev_uid_to_integer(adev, &uid); > > + if (ret == 0 && node->acpi.uid == uid) > > break; > > + if (ret == -ENODATA && node->acpi.uid == 0) > > break; > > ? > > With that fixed, > > Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Thanks!
diff --git a/drivers/firmware/efi/dev-path-parser.c b/drivers/firmware/efi/dev-path-parser.c index eb9c65f97841..113b3ca1bd76 100644 --- a/drivers/firmware/efi/dev-path-parser.c +++ b/drivers/firmware/efi/dev-path-parser.c @@ -15,9 +15,11 @@ static long __init parse_acpi_path(const struct efi_dev_path *node, struct device *parent, struct device **child) { - char hid[ACPI_ID_LEN], uid[11]; /* UINT_MAX + null byte */ struct acpi_device *adev; struct device *phys_dev; + char hid[ACPI_ID_LEN]; + long ret; + u64 uid; if (node->header.length != 12) return -EINVAL; @@ -27,12 +29,12 @@ static long __init parse_acpi_path(const struct efi_dev_path *node, 'A' + ((node->acpi.hid >> 5) & 0x1f) - 1, 'A' + ((node->acpi.hid >> 0) & 0x1f) - 1, node->acpi.hid >> 16); - sprintf(uid, "%u", node->acpi.uid); for_each_acpi_dev_match(adev, hid, NULL, -1) { - if (adev->pnp.unique_id && !strcmp(adev->pnp.unique_id, uid)) + ret = acpi_dev_uid_to_integer(adev, &uid); + if (ret == -ENODATA && node->acpi.uid == 0) break; - if (!adev->pnp.unique_id && node->acpi.uid == 0) + if (ret == 0 && node->acpi.uid == uid) break; } if (!adev)
ACPI utils provide acpi_dev_uid_to_integer() helper to extract _UID as an integer. Use it instead of custom approach. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> --- drivers/firmware/efi/dev-path-parser.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)