linux-kernel - [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport

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Message-Id: <20231123040355.82139-13-david.e.box@linux.intel.com>
Date:   Wed, 22 Nov 2023 20:03:47 -0800
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        ilpo.jarvinen@...ux.intel.com, rajvi.jingar@...ux.intel.com,
        dave.hansen@...ux.intel.com, peterz@...radead.org
Subject: [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport_unmap cleanup.h support

Add auto-release cleanups for iounmap() and ioport_unmap().

Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
Suggested-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
V2 - Move from linux/io.h to asm-generic/io.h. Adds iounmap cleanup if
     iounmap() is defined. Adds ioport_unmap cleanup if CONFIG_IOPORT_MAP
     is defined.

 include/asm-generic/io.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index bac63e874c7b..9ef0332490b1 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -8,6 +8,7 @@
 #define __ASM_GENERIC_IO_H
 
 #include <asm/page.h> /* I/O is all done through memory accesses */
+#include <linux/cleanup.h>
 #include <linux/string.h> /* for memset() and memcpy() */
 #include <linux/types.h>
 #include <linux/instruction_pointer.h>
@@ -1065,6 +1066,10 @@ static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
 #endif
 #endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
 
+#ifdef iounmap
+DEFINE_FREE(iounmap, void __iomem *, iounmap(_T));
+#endif
+
 #ifndef ioremap_wc
 #define ioremap_wc ioremap
 #endif
@@ -1127,6 +1132,7 @@ static inline void ioport_unmap(void __iomem *p)
 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
 extern void ioport_unmap(void __iomem *p);
 #endif /* CONFIG_GENERIC_IOMAP */
+DEFINE_FREE(ioport_unmap, void __iomem *, ioport_unmap(_T));
 #endif /* CONFIG_HAS_IOPORT_MAP */
 
 #ifndef CONFIG_GENERIC_IOMAP
-- 
2.34.1