linux-stable/arch/x86/kernel/eisa.c
Maciej W. Rozycki a678164aad x86/EISA: Dereference memory directly instead of using readl()
Sparse expect an __iomem pointer, but after converting the EISA probe to
memremap() the pointer is a regular memory pointer. Access it directly
instead.

[ tglx: Converted it to fix the already applied version  ]

Fixes: 80a4da0564 ("x86/EISA: Use memremap() to probe for the EISA BIOS signature")
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/alpine.DEB.2.21.2408261015270.30766@angie.orcam.me.uk
2024-08-29 15:57:09 +02:00

26 lines
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C

// SPDX-License-Identifier: GPL-2.0-only
/*
* EISA specific code
*/
#include <linux/cc_platform.h>
#include <linux/ioport.h>
#include <linux/eisa.h>
#include <linux/io.h>
#include <xen/xen.h>
static __init int eisa_bus_probe(void)
{
u32 *p;
if ((xen_pv_domain() && !xen_initial_domain()) || cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
return 0;
p = memremap(0x0FFFD9, 4, MEMREMAP_WB);
if (p && *p == 'E' + ('I' << 8) + ('S' << 16) + ('A' << 24))
EISA_bus = 1;
memunmap(p);
return 0;
}
subsys_initcall(eisa_bus_probe);