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[v4,1/5] lib/pci_iomap.c: fix cleanup bugs in pci_iounmap()

Message ID 20231205153629.26020-3-pstanner@redhat.com
State New
Headers show
Series Regather scattered PCI-Code | expand

Commit Message

Philipp Stanner Dec. 5, 2023, 3:36 p.m. UTC 
pci_iounmap() in lib/pci_iomap.c is supposed to check whether an address
is within ioport-range IF the config specifies that ioports exist. If
so, the port should be unmapped with ioport_unmap(). If not, it's a
generic MMIO address that has to be passed to iounmap().

The bugs are:
  1. ioport_unmap() is missing entirely, so this function will never
     actually unmap a port.
  2. the #ifdef for the ioport-ranges accidentally also guards
     iounmap(), potentially compiling an empty function. This would
     cause the mapping to be leaked.

Implement the missing call to ioport_unmap().

Move the guard so that iounmap() will always be part of the function.

CC: <stable@vger.kernel.org> # v5.15+
Fixes: 316e8d79a095 ("pci_iounmap'2: Electric Boogaloo: try to make sense of it all")
Reported-by: Danilo Krummrich <dakr@redhat.com>
Suggested-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
---
 lib/pci_iomap.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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Patch

diff --git a/lib/pci_iomap.c b/lib/pci_iomap.c
index ce39ce9f3526..6e144b017c48 100644
--- a/lib/pci_iomap.c
+++ b/lib/pci_iomap.c
@@ -168,10 +168,12 @@  void pci_iounmap(struct pci_dev *dev, void __iomem *p)
 	uintptr_t start = (uintptr_t) PCI_IOBASE;
 	uintptr_t addr = (uintptr_t) p;
 
-	if (addr >= start && addr < start + IO_SPACE_LIMIT)
+	if (addr >= start && addr < start + IO_SPACE_LIMIT) {
+		ioport_unmap(p);
 		return;
-	iounmap(p);
+	}
 #endif
+	iounmap(p);
 }
 EXPORT_SYMBOL(pci_iounmap);