rust: pci: use 'static lifetime for PCI BAR resource names

pci_request_region() stores the name pointer directly in struct
resource; use &'static CStr to ensure the pointer remains valid even if
the Bar is leaked.

Cc: stable@vger.kernel.org
Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/all/20260522004943.CDA7C1F000E9@smtp.kernel.org/
Fixes: 3c2e31d717ac ("rust: pci: move I/O infrastructure to separate file")
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260525202921.124698-2-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

diff --git a/rust/kernel/pci/io.rs b/rust/kernel/pci/io.rs
index ae78676c927ff5c8ccd9f68bddef28e3c541aa4a..3ce21482b0797d23d0d6e32db6ebf1192acc3d18 100644 (file)
--- a/rust/kernel/pci/io.rs
+++ b/rust/kernel/pci/io.rs
@@ -153,7 +153,7 @@ pub struct Bar<const SIZE: usize = 0> {
 }
 
 impl<const SIZE: usize> Bar<SIZE> {
-    pub(super) fn new(pdev: &Device, num: u32, name: &CStr) -> Result<Self> {
+    pub(super) fn new(pdev: &Device, num: u32, name: &'static CStr) -> Result<Self> {
         let len = pdev.resource_len(num)?;
         if len == 0 {
             return Err(ENOMEM);
@@ -252,7 +252,7 @@ impl Device<device::Bound> {
     pub fn iomap_region_sized<'a, const SIZE: usize>(
         &'a self,
         bar: u32,
-        name: &'a CStr,
+        name: &'static CStr,
     ) -> impl PinInit<Devres<Bar<SIZE>>, Error> + 'a {
         Devres::new(self.as_ref(), Bar::<SIZE>::new(self, bar, name))
     }
@@ -261,7 +261,7 @@ impl Device<device::Bound> {
     pub fn iomap_region<'a>(
         &'a self,
         bar: u32,
-        name: &'a CStr,
+        name: &'static CStr,
     ) -> impl PinInit<Devres<Bar>, Error> + 'a {
         self.iomap_region_sized::<0>(bar, name)
     }