Hendra Manudinata
ef935a7584
Recent test shows that j4lte requires these patches to be able to boot into postmarketOS, as well as some additional features to make it a little bit more usable: 1. Disabling direct I/O patch This is required to fix kernel panic during e2fsck performed by initramfs. The root cause is still unknown and thus needs further investigation. But for now, while we're in downstream kernel, temporarily add this hacky patch. 2. Initialize framebuffer later This fixes kernel panics when `CONFIG_FRAMEBUFFER_CONSOLE` is enabled, caused by unitialized pointers & mutex. This could be applied on other older Samsung devices that use similar DECON. Signed-off-by: Hendra Manudinata <hm@ndraa.xyz> Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8574>
43 lines
1.3 KiB
Diff
43 lines
1.3 KiB
Diff
From a285560a29a910bb51bd8d392ccb4be2f6bf2d7e Mon Sep 17 00:00:00 2001
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From: Hendra Manudinata <manoedinata@daunscape.tech>
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Date: Wed, 11 Mar 2026 11:31:11 +0700
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Subject: [PATCH] [HACK] loop: Force disable Direct I/O operations
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This somehow fixes kernel crash during boot, while initramfs performs
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e2fsck. Still unknown what's the reason of the crash, but for now,
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bypassing direct I/O operation seems to work.
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Signed-off-by: Hendra Manudinata <manoedinata@daunscape.tech>
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---
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drivers/block/loop.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/drivers/block/loop.c b/drivers/block/loop.c
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index 15157a3ea..2d2b752ac 100644
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--- a/drivers/block/loop.c
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+++ b/drivers/block/loop.c
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@@ -687,6 +687,11 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
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if (!file)
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goto out;
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+ /* POSTMARKETOS:
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+ * Disable Direct I/O to prevent kernel panics during e2fsck
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+ */
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+ file->f_flags &= ~O_DIRECT;
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+
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error = loop_validate_file(file, bdev);
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if (error)
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goto out_putf;
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@@ -864,6 +869,11 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
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if (!file)
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goto out;
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+ /* POSTMARKETOS:
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+ * Disable Direct I/O to prevent kernel panics during e2fsck
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+ */
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+ file->f_flags &= ~O_DIRECT;
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+
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error = -EBUSY;
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if (lo->lo_state != Lo_unbound)
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goto out_putf;
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